Rubber heel.



E. S. ABBOTT. RUBBER HEEL. APPLICATION IVILIID MAY 11, 1912.

1,11 12,749, Patented 0015.6, 1914.-

mm rma. mc.. um.. ummm. u.

PATENT; onirica.

Essex s; enorm? orfnannnnnaassaonusn'rrs; A

laurens; anni.

Specieatioii'of Letters Patent;

Application nleduayll, 11912; l Serial No. 696,666. v.

Patented oche, 19,14.

To all wh'ofmfit may eoncern Be it known that I, Essex S.-ABo'rr,acitizen of the Unitedr States, re'f.-;iding at? Malden, in the.county of. Middlesexand- Stat'e of Massachusetts, have 'invented' a4certain new and'useul Improi/'ementv inltulw berfHeels, of which theollovvingis -a speci A iication. j j x This invention has for its objectthe production of-a durable and eliicient elastic rubber heel forboots'and shoes, in which. liability to slip' on smooth surfaces shallbereduced to the minimum,. the heel being' adapted for attachment asarcushioningzlift. to an ordinary rigid heelvin the usualnia'nf.

ner.

The invention. consists in the: improve-4 ments which 1 willnowproceedato. describev 4and-claim.'

Of the accompanying drawings orming a part'oithis specilication, Figure1 representsa plan View oa rubber heelfconstructlfed in accordance withmy invention. Fig.

. 2 represents a section on line. 2 -2 of Fig. 3 represents aperspective View of the heel mold hereinafterrreferred to. Fig. .4represents longitudinal section of themold shown by Fig. 3, showing the.manner offorming the anti-slipping ,lling forming a .part of the.improved heel. Fig. repre-V sents a sectional view of the body-formingportion of the mold, the lling ti l forming por-f tion being.removedaiid the ing and body assembledjin the mold, the binding layerhereinafter referred to'being 4shown separately. Fig. 6 represents aView similar to Fig. 5, showing the binding layer in place .and the moldclosed preparatory to the vulcanization of lthe rubbenparts.

The same letters of reference indicate the same part-s in all of thefigures.

'In carrying out my invention I provide a mold 12 having a heel-formingcavity '.13 and adapted to be closed-by a cover 14, the whole'forming avul mizing mold adapted 'to confine unvulcaniied' rubber parts whilethey are being vulcanized in the usual Inanner.-

15 represents a removable inner mold formed to enter the cavity 13 andto de- 'taohably engage the bottom thereof, the mold 15 having thinwalls of sheet brass or otherl'suitable material. The bottom lof the'cavity lninay have a groove 16 adapted to receive; i

'spaced. front the marginal 'AA- walls of the c-av-ity 13, the inoldlbeing-removablefrom said groove. The removable inner beingin' Place, itis lled with a filling 1S coinposed of @mixtureof unimleanized rubbererably brous. I have used with satisfacthe bers extending irregularly`through the rubber and being more or lessseparated from each otherthereby, as indicated by Fig. 1. The rubber ingredient of the tillingtherefore extends continuously through thelling and is-exposed on thesurfaces thereof so that it' is adapted-to be firmly unitedto the bodyand binding layer ofthe heel vby vulcanization, as hereinafterl de- 1.remove the inner mold 1 5, and form in the portion Iolf-.the cavity13=which surrounds said iilling a heel bod 19 of: homogeneousun'vulcaniz'ed rubber,. -iat is,rubber'whether adulteratedV or not, ofthe character ordinarily used for rubbertheels andrnot mixed withanti#slippingmaterial..` The body 19 is: inv close'contaet! withthe'-filling,. as indicated by F ign-5.' I prefer to next cover the ,uppersurfaces ofthe body ,-1 9and.- IillinglS iwith af binding 'layer 20 ofhomogeneous un- 'vulcanized rubber,the thickness of the said body andfilling being less than'the depth ofthe cavity 13, so that the top ofthe layer 20 is. about ush Withitlie upper surfaceof themold 12. Thecover 14 is now applied and secured and the mold is subjected to hea-tsuitable to vulcanize the'rubber of the assmbled parts which are ,thusVfirmly uni ed. The product is the heel represented by Figs. 1 and 2,having the anti-slipping core 1 8'eXposed on its treadsurface andsurrounded by, and integral with the homogeneous body 19,- which has -amargin adapted tofbe trimmed to fit a leather heel.

The proportion of rubber in the core 18 and; a suit-ableanti-slipping'material, pref toryresults-"bers of wool or animal hair,

scribed. Afterthe illinglS is thus formed soA 'must be sufficient toinsure a'homogeneous union between the core and the heel body duringvulcanization.4 Thus the antislipping core orfilling forms an' integral,inseparable part of the structure and cannot become loosened' and dropout, so that a common-objection torubber heels with frictional plugs asheretofore made, is over- .come by my invention. The binding layervulcanized both to the body 19 and filling 18, materially .adds to thesecure confinenient of the lilling, althqughthe union beditions.

The filling 18 dilersi'roni a plug coroposed of a layer of Woven fabriccoated with rubber Cement, and rolled into o circuler body inserted inthe rubber body the heel. Such plug is united to the heel body only bythe thin film or rubber on the outer surface of the plug and isliable obec-ome detached and drop out of the heel body. The filling 18 composedof @mixture oft rnbber and libere, extending irregularly through tberubber separated from each other more or vless thereby, is insepereblyconnected, with the body of 'the heel by the yuloenizing of the rubberof the heel body and the rubber 'of the filling., y

I claim:

1. A rubber heel comprising e heel body# provided with e tread Surfaceand an ontislipping core integral therewirh and composed of e plug ofrubber having u lling of friction materie-l dietributed therethrough,said core extending inwardly from said treed surteice7 the rubber insaid core being in sucient proportion to insure homogeneous union of thecore with the heel body when vulcanized.

2. A rubber heel comprising o heel body provided with a tread surfaceand baring an antislipping core integral therewith and composed of aplug of rubber having a illing of friction meterial'distributedirreguigiene@ lai-ly throughout the same, said core eirtending inwardlyfrom the tread surface, the rubber in seid core being in sufticient.proportion to insure a homogeneous union of the core with the heel bodywhen vulcanized 3. A rubber heel comprising a heel body provided with utreed surface and having en :intislipping core integral -therewith andcomposed of a, plug of'rubber having a lilling or" fibrous materielirregularly distributed throughout the saine, said core extendinginwardly from said trend surface, bhe rubber in seid core being insutlicient proportion to insure a homogeneous union of the eore with theheel body when vulcanized.

f4, A rubber heel eoniprieing a heel body provided with e. treed surfaceand hearing' en entislipping core inte ral therewith and composed oi? nplug ru ber haring ely lilling of friction materie-l distributedthroughoutJ bhe senr-ea Suid core extending inwardly from seid tr adsurface, the rubber in said core being in sutllcient proportion toinsure e, homogeneous union between the core and the heel body 'whenvulcanized, and en integral binding layer of rubber overlying said heelbody and tbe innerend of seid core.

ln testimony whereof l have affixed. my signature, in presence oit twoWitnesses.

ESSEX S. ABBOTT.

1Witnesses z C" lll., Bron/Ni l?. 33V, Pnzzrxrrr.

